Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime

Details Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime

2010-04-26

arxiv.org/abs/1004.4435v1

Phys. Rev. Lett. 105 056804 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related work at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.105.056804

We investigate dynamic nuclear polarization in quantum point contacts (QPCs) in the integer and fractional quantum Hall regimes. Following the application of a dc bias, fractional plateaus in the QPC shift symmetrically about half filling of the lowest Landau level, \nu=1/2, suggesting an interpretation in terms of composite fermions. Polarizing and detecting at different filling factors indicates that Zeeman energy is reduced by the induced nuclear polarization. Mapping effects from integer to fractional regimes extends the composite fermion picture to include hyperfine coupling.

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